Washington state’s health exchange has just released an app for iPhone and Android users aimed at so-called "young invincibles," or young adults up to age 35. Their participation is crucial for the Affordable Care Act to work. But traditionally, this age group is least likely to buy health insurance for a variety of reasons.

Originally, when two people wanted to engage in sexual relations, they had to first meet and then have a requisite date or two before finally getting down to business. A new wave of mobile apps wants to do away with all that hoopla. The apps aim to bring two — or more than two if that’s your fancy — people together just by hitting a button. No strings attached, no wooing necessary. Ross Reynolds talks with Kevin Roose about this market and what it means for safe sex.